Speech, strictly speaking, is ephemoral. The written word even is subject to the ravages of time and materials - letters and books can be destroyed by fire and age, by accident or purpose.

But what is written on the internet can be saved forever, archived, aggregated, augmented, cross preferences, rebroadcast, and made into precision weapon.

And so truth tellers are at a disadvantage because the liars can use every technological advancement at their disposal, but the truth tellers must for self preservation retreat into the shadows.